Countersink bit set 1 cutting edge 3 piece set of countersink bits for easy fast countersinking and deburring in soft materials the countersink bits made of ground tool steel have a 90 cutting edge manufactured to tool standard with diameters of 8 10 and 12 mm the countersink bits are suitable for non ferrous metals plastics and wood ground countersink bits made of tool steel with 90 cutting edge manufactured to tool standard diameters 8 10 12 mm